<?php

/* SVN FILE: $Id: SassExtendNode.php 49 2010-04-04 10:51:24Z chris.l.yates $ */
/**
 * SassExtendNode class file.
 * @author      Chris Yates <chris.l.yates@gmail.com>
 * @copyright   Copyright (c) 2010 PBM Web Development
 * @license      http://phamlp.googlecode.com/files/license.txt
 * @package      PHamlP
 * @subpackage  Sass.tree
 */

/**
 * SassExtendNode class.
 * Represents a Sass @debug or @warn directive.
 * @package      PHamlP
 * @subpackage  Sass.tree
 */
class SassExtendNode extends SassNode
{

    const IDENTIFIER = '@';
    const MATCH = '/^@extend\s+(.+)/i';
    const VALUE = 1;

    /**
     * @var string the directive
     */
    private $value;

    /**
     * SassExtendNode.
     * @param object source token
     * @return SassExtendNode
     */
    public function __construct($token)
    {
        parent::__construct($token);
        preg_match(self::MATCH, $token->source, $matches);
        $this->value = $matches[self::VALUE];
    }

    /**
     * Parse this node.
     * @return array An empty array
     */
    public function parse($context)
    {
        # resolve selectors in relation to variables
        # allows extend inside nested loops.
        $this->root->extend($this->value, $this->parent->resolveSelectors($context));
        return array();
    }

}